Blacklist partial swaps on linux

ui/gl/gl_surface_egl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This include must be here so that the includes provided transitively
 // by gl_surface_egl.h don't make it impossible to compile this code.
 #include "third_party/mesa/src/include/GL/osmesa.h"
 
 #include "ui/gl/gl_surface_egl.h"
 
@@ skipping 541 matching lines @@
     LOG(ERROR) << "Failed to create surface.";
     return false;
   }
   return true;
 }
 
 EGLSurface NativeViewGLSurfaceEGL::GetHandle() {
   return surface_;
 }
 
-std::string NativeViewGLSurfaceEGL::GetExtensions() {
-  std::string extensions = GLSurface::GetExtensions();
-  if (supports_post_sub_buffer_) {
-    extensions += extensions.empty() ? "" : " ";
-    extensions += "GL_CHROMIUM_post_sub_buffer";
-  }
-  return extensions;
+bool NativeViewGLSurfaceEGL::SupportsPostSubBuffer() {
+  return supports_post_sub_buffer_;
 }
 
 bool NativeViewGLSurfaceEGL::PostSubBuffer(
     int x, int y, int width, int height) {
   DCHECK(supports_post_sub_buffer_);
   if (!eglPostSubBufferNV(GetDisplay(), surface_, x, y, width, height)) {
     DVLOG(1) << "eglPostSubBufferNV failed with error "
              << GetLastEGLErrorString();
     return false;
   }
@@ skipping 288 matching lines @@
     }
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 #endif
 
 }  // namespace gfx